棒状電磁石による長空隙磁気浮上の試み

This paper reports on a new concept of magnetic levitation method using single pole of a controlled electromagnet consisting of a cylindrical electromagnet and a cylindrical permanent magnet. As the flux flows from the electromagnet along an open-loop magnetic circuit, the attenuation of the attractive force to the gap distance is relatively small. In addition, the permanent magnet acts as a bias flux, therefore, this magnetic levitation method can enlarge the air-gap distance between the controlled electromagnet and the floating object. The overall attractive force is modeled by summation of forces of both the electromagnet and the permanent magnet. A stable levitation condition has been achieved by means of a 0.33 A control current and a 42mm air-gap between the electromagnet and a 0.5g permanent magnet.